Fuel distributor



F. C. PICKARD FUEL DISTRIBUTOR Nov. 21, 1933.

, 1950 2 Sheets-Sheet l Filed Sept. 18

1 VENTOR ATTORNEY Nov. 21, 1933. F, C HCKAD 1,936,142

FUEL DI STRIBUTOR Filed Sept. 18, 1930 2 Sheets-Sheet 2 IN VE N'T OR TTORNEY back and. fine coal at 5 5 trated and claimed.

Patented Nov. 2l, 1933 PATENT v'orrics i 1,936,142 FUEL DISTRIBUTOR Frank C. Pickard, Erie, Pa., assigner to The Standard Stoker Company, Incorporated, a corporation of Delaware Application September 18, 1930 Serial No. 482,714

7 claims.. (o1. 11o- 104) My invention vrelates particularly to scatter feed l0 uid blast, both the coarse andne fuel are subjected to blast of the same intensity, with the result that the fine particles are driven farther into the rebox than the fuel bed is largely composed of coarse coal at the the front, the intervening part being graduated from coarse to nne. .Attempts have been made to effect a separation of the coarse from the fine coal and subjecting the coarse coalto a high pressure fiuid blast and the 2O fine coal to a low pressure fluid blast in order to project an equal amount of the nes over the entire surface of the reboX and to project `an equal amount ofthe larger sizes all over the firebox but some indiscriminate commingling of the 25 fine lcoal and coarse coal takes placeon the single firing table and causes the fineand coarse coal to be subjected to a blast of the same intensity.

It is the principal object of my invention to provide an improved distributing system whereby the .39 coarse fuel is equally distributed over the entire rebox and the fine fuel is also equally distributed over the entire rebox. vMore particularly it is an object of my invention to providev in a pressure fluid blast distributing system an upper and a lower table, means for vclassifying the fuelaccording to size whereby coarse fine fuel is collected on the lower plate, a pressure fluid blast of high intensity for projecting the 4 0 coarse fuel into the rebox, and a pressure fluid blast of low intensity for projecting the fine fuel into the rebox. A

It is a further object ofthe invention to design the upper plate in such a mannerthat a portion A4 5 of Vthecoarse fuel is delivered from the upper to the lower plate at designatedplaces wherebyv the vcoarse fuel is subjected to the action of Athe low pressure blast and delivered to the rear corners of the rebox. Y

With these and other objects in View which will be apparent as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts vhereinafter more fully described, illuscoarser lumps and the and 1 3 the grates.

.15v rigidly supported fuel is collected on the upper plate and A preferred and practical embodiment of the invention is illustrated in the accompanying drawings, in which n Fig. 1 is a vertical-section of a portion of a furnace and a stoker therefor, showing the invention in position therein;

Fig. 2 is a'detail plan section on the line 2-f2 of Fig. 1;

Fig. 3 is a detail vertical 3 3 of Fig. 1 and Fig. 4 is an isometric view of the distributor table arrangement.

The invention is particularly applicable to stokers for use with locomotives and for the purpose of best illustrating the invention it will be so described, but its use is not so limited in its application and may equally find use with stokers for furnaces of other types where the advantages of my construction are desired.

The numeral 10 denotes a locomotive boiler 75 flreboX, 11 the ring opening in the backwall 12 A suitable stoker, indicated as a whole atli, is provided for conveying the fuel from a source of supply and delivering it to the-firing opening ll. The part of the stoking mechanism illustrated comprises a riser conduit from the backwall l2 by suitable means, as by the bracket 16, and a conduit 17 leading from a source of fuel supply and universally connected at its forward end with the lower end of the riser conduit l5. The riser section on the line conduit 15 is .provided with a removable cover section 18 which 4may be hinged at its upper end and held in closed position by a latch 19, whereby access may be had to the interior of the riser conduit.

The fuel delivered to the riser conduit 15 is received by a novel and practical distributing system, indicated generally by the numeral 20. This means provides an arrangement whereby the fine fuel and the coarse fuel is separated, collected on independent firing tables and projected into the rebox by separate fluid pressure blasts, as will now be described.

The distributing system comprises a distribuloo tor member denoted generally by the numeral 21 having an upper ring table 22 and a lower firing table 23. The upper ring table 22 constitutes a continuation of the `bottom wall orfloor 211 of the riser conduit 15and is provided with 105 a rectangular opening 25 in Aits rearward portion, al V-shaped abutment 26 at its forwardportion intermediate'of ythe sides of the table, the indentations 27, 27a in the forward side portions of the table 22 and the abutment members 2828a. llo

. upper table to be dropped onto the lower firing table where it is projected into the iirebox by the lower pressure blast as will be hereinafter i described. rThe forward side portions of the lower firing table are provided with the pockets 29, 29a, and the abutment members 30, 30a which serve to receive and direct a portion of thel fuel to the rear corners of the iirebox.

Rearwardly of the distributor member 21 and outside of the iirebox is a vertically disposed distributor head 3l to which pressure fluid such as steam is supplied by suitable supply pipes. This distributor head is provided with jet openings 32 in its forward face in a position between the lower and upper distributor plates and at the rear of the lower plate and also rearward of the riddle means of the upper plate. These openings lead from the low vpressure chamber 33 of the head 31 as best seen in Fig. 3. Pressure uid is supplied by the supply pipe 34 to the chamber 33.Y The distributor head'Bl is also provided with forwardly extending and somewhat laterally aring fingers or jet members S5 extending from the top of the head forward across the `aperture 25 in the upper iring table or plate 22 forming therewith a riddling means 36. The 'lingers or rjet members terminate just forward of the aperture 25 'and each nger is provided with an orifice or jet opening 37 leading into either one or the other of a pair of high pressure chambers 38 and 39 within the head 31, these high pressure chambers being separated from the low i pressure chamber by suitable partition walls and steam or other pressure iuid is supplied thereto by the pipes 40 and Lll respectively. Suitable valves, not shown, in each supply permit control of the pressure of fluid in each chamber. Preferably the pipe 34 supplies low pressure fluid to f the chamber 3 3 for emitting a low pressure blast `through the jet openings 32 acrossthe lower firing table and the pipes 49 and fil supply high pressure fluid tothe chambers 38 and 39, whereby a blast of comparatively high pressure issues from the jet members 35 sweeping across the front portion of the upper firing table.

In operation the fuel advanced through the riser conduit l5, is deposited on vthe riddle means 36 and is urged thereover by reason of the pressure of the advancing column of fuel. As the fuel passes across the riddle the finer particles of fuel are separated from the coarse fuel and fall through the aperture onto the lower firing table 23 within the zone of action of a low pres sure Huid blast issuing from the jet openings 32. This blast functions in cooperation with the lower -ring table and the pockets 29, 29d and the abutment members 30, 30a thereon to distribute the fine-fuel over the entire ireboX. The coarse fuel tumbles over the forward end Yof the fingers 35 onto the upper firing plate from where it is distributed over the entire flrebox Yby the cooperation of the high pressure blast issuing from the jet openings 37' with the upper firing table and its V-shaped abutment 26 and abutment members 28, 28a. The indentations 27 and 27a allow some of the lump fuel to fall into the rear portion of the reboX to aid in placing the lump fuel on all parts of the fire. The upper firing table 22 extends forwardly beyond 'the lower firing table 23 and serves as a cover over the ne fuel being distributed by the lower table and low pressure blast. i

In my construction a separation of the coarse and fine fuel occurs prior to subjecting the fuel to the action of Ythe pressureY blast, hence an almost complete separation is attained. The two divisions of fuel may then be projected by their respective jets, the larger sizes with the high pressure jet over the top firing table, and the lines over the lower firing table, with the low pressure jet. By this arrangement the fines are distributed over the fire at a point beneath the high pressure blast, which then becomes a protective covering preventing loss of the liner particles of fuel. It will be observed that the arrangement and structure of the plates and respective blasts provide an equal classification of the coarse and line particles of fuel to all paris of the fire.

It will be apparent that the invention is capable of certain modifications without departing from the intended scope of the invention.y

I claim:

l. In a fuel distributing system for scattering fuel in aerial paths over a nre, the combination of a lower firing plate having pressure fluid' blast means at the rear iereof, an upper liring plate spaced above said lower plate, means for delivering fuel to said upper plate, an opening Vin the rearward portion of said upper plate, a plurality of nngers extending longitudinally forward over said opening forming therewith a riddle and jet openings in said fingers arranged to issue a blast of pressure fluid forward said upper firing plate.

2. In a fuel distributing system for scattering fuel in aerial paths over a nre, an upper and a lower firing plate each of which is arranged for the passage of fuel thereo-ver, means for delivering fuel to said upper plate, riddling means at the rearward portionof said upper plate whereby fine fuel drops through said riddling means onto the lower firing table and the coarse fuel passes over said upper firing table, a low pressure 'blast i means arranged to project the lines from said lower plate and blast means of higher pressure arranged to pro-ject the coarse fuel Vacross said upper plate, and indentations in said upper plate forward of said riddling meansY arranged to permit a portion of the coarse fuel to drop onto predetermined parts of said lower plate, whereby such portion of coarse fuel is projected over predetermined parts of the faire by said low pressure blast means. i

3. In a fuel distributing system for scattering fuel in aerial paths over a fire, an upper and a lower ring plate each of which is arranged for the passage of fuel thereover, means for delivering fuel to said upper plate, riddling means at the rearward portion vof said upper plate'whereby through said riddling means onto fine fuel drops the lower firing table and the coarse fuel passes over said upper ring table, low pressure blast means arranged to' project 4 lower plate and blast means of higher pressure forward of said riddling means fory projecting coarse fuel across said upper plate, and indentations in the side portions of said upperplate forward of said riddling meansarranged'to permit l a portion of the coarseffuel to be dropped onto the forward side portions of said lower plate into the zone. of action of said low pressure blast means, whereby such portion of the coarse fuel -is projected over the rear corners ofthe re.' V

of Vsaid riddle across 5 4 the fines fromv -said means at the rear thereof,

4. In a fuel distributing system for scattering fuel in aerial paths over a re, the combination of a lower firing plate having pressure fluid blast an upper firing plate spaced over and above said lower plate and extending forwardly at least as far as the forward marginal edge of said lower plate, means for delivering fuel to said upper plate, riddling means at the rearward portion of said upper plate whereby line fuel drops through said riddle onto the lower firing table and the coarse fuel passes over said upper firing table, and pressure fluid blast means on said upper plate acting on the fuel forward of said riddling means.

5. In a fuel distributing system, the combination of a lower firing plate, an upper firing plate spaced over and above said lowerplate, an opening in the rearward central portion of said upper plate, a distributor head at the rear of said plates and a plurality of finger-like extensions formed with said distributor head and extending forwardly therefrom over the opening in said upper firing plate forming therewith a riddling means.

6. As a new article of manufacture a distributor member in the form of a unitary structure comprising a pair of plates spaced one above the other, the upper of said plates having an opening in its rearward central portion and indentations in its forward side portions, and the lower of said plates having pockets formed in its forward side portions.

7. As a new article of manufacture a distributor member comprising a pair of plates spaced one above the other, the upper of said plates having an opening in its rearward central portion, indentations in its forward side portions, abutments bounding the forward marginal edges of said indentations, anda V-shaped abutment on the forward portion of said upper plate intermediate thesides thereof, the lower of said plates having pockets formed in 'its forward side portions and abutments bounding the forward marginal edge of said pockets.

F. C. PICKARD. 

